/*
 * Copyright 2020 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.workbench.common.stunner.kogito.client.services.util.impl;

import java.util.HashMap;
import java.util.Map;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;

import elemental2.promise.Promise;
import org.appformer.kogito.bridge.client.resource.ResourceContentService;
import org.appformer.kogito.bridge.client.resource.interop.ResourceContentOptions;
import org.kie.workbench.common.stunner.kogito.client.services.util.WorkItemIconCache;

@ApplicationScoped
public class WorkItemIconCacheImpl implements WorkItemIconCache {

    private Map<String, Promise<String>> cachedIcons = new HashMap<>();

    private final ResourceContentService resourceContentService;

    @Inject
    public WorkItemIconCacheImpl(final ResourceContentService resourceContentService) {
        this.resourceContentService = resourceContentService;
    }

    @Override
    public Promise<String> getIcon(String iconPath) {
        return cachedIcons.computeIfAbsent(iconPath, this::lookupPromise);
    }

    private Promise<String> lookupPromise(String iconPath) {
        return resourceContentService.get(iconPath, ResourceContentOptions.binary())
                .catch_(error -> {
                    return Promise.resolve("");
                });
    }
}
